Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2a^3+9a^2+a ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * a ^ 3 + 9 * a ^ 2 + a ≥0         (1)

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    From inequality(1)：
         -4.386001 ≤ a ≤ -0.113999 或  a ≥ 0

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    The final solution set is :
         -4.386001 ≤ a ≤ -0.113999 或  a ≥ 0

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